أكاديميا - كولنز معاجم الجيب العلمية - البيولوجيا انكليزي - فرنسي - عربي الحرف ٢_ l

Academia - Collins Scientific Pocket Dictionaries - Biology
English - French - Arabic letter 2_ L


lignin
lignine f

Two organic compound wood
Deposited in the cell walls of xylem vessels, which gives it strength. Lignin is an important component of wood. See xylem.


limit factor
facteur m limiteur

Determination factor. Any environmental factor whose level at a certain time obstructs some activity of an organism or a population of organisms. Such as the effects of temperature and light intensity on the rate of photosynthesis.

High light intensity
Low light intensity.
temperature
Photosynthesis rate

Increasing the temperature has little effect when the light intensity is low. This means that the intensity of light is a determining factor in this case.


lipase
lipase f

Lipase. An enzyme digests fat and turns it into fatty acids and glycerol by hydrolysis. The pancreas and the end intestine secrete lipase in mammals.

Glycerol
Stearic acid
Stearic acid
Stearic acid
Libar
Glycerol
Stearic acid
Stearic acid
Stearic acid



lipid
lipide m

Anointing. See fat.


liver
foie m

The liver is the largest organ in the body of a vertebrate animal
A large area of ​​the upper abdomen,
It is closely linked to the alimentary canal.
. See circulatory systems and digestion

Some of the many liver functions are summarized as follows:
(a) Bile production.
(b) Deamination of excess amino acids.
(c) Regulating blood sugar by mutual conversion between glucose and glycogen.
(d) Storage of iron and vitamins A and D.
(e) Detoxification of toxic by-products. (f) The release of heat produced by chemical activity
Liver cells and their distribution. (g) Converting stored fat for use by tissues.
(h) Fibrinogen industry.

long sight (or hypermetropia)
hypermetropie f

Farsightedness . A defect in the human eye caused mainly by the distance between the lens and the retina being shorter than normal. This results in nearby objects being focused behind the retina, giving blurred vision. Farsightedness is corrected using lenses. Converging (convex convex).

The length of view
Corrected farsightedness

lung
poumon m

Lung. The breathing organ in mammals, amphibians, reptiles and birds. The lungs in mammals are two elastic sacs in the thorax that can expand or contract with the movement of the chest, so that air is constantly taken in and expelled. The trachea connects the lungs and the air. The trachea is divided into two bronchi that enter the lungs and branch into many bronchioles that end in millions of air sacs called alveoli, which are the gas exchange surface and remain in close contact with the blood vessels that bring blood.
From the heart and return it to him.

Air passages in the lungs
trachea
Cartilaginous rings.
bronchus
Bronchioles

Look
gas exchange and breathing in mammals
(mammals)


luteinizing hormone (LH)
luteinizine f. hormone / de luteinisation

Yellowish hormone A hormone secreted by the gland
Pituitary gland in vertebrates. See ovulation.


lymph
lymph node m

Lymph. A fluid filtered from blood capillaries due to high pressure at the arterial end of the capillary bed. Lymph, or tissue fluid similar to plasma (except for a lower concentration of plasma proteins), bathes the tissues and serves as a medium in which substances are exchanged between capillaries and cells. For example, oxygen and glucose diffuse into the cells while carbon dioxide and urea are removed. The lymph filters back to the capillaries or to the vessels called lymphatics, where it is connected to the general circulation via the lymphatic system.

Lymphocytes, capillaries and cells


lymphatic system
Appareil lymphatique

The lymphatic system is a vascular system containing lymphatic fluid in vertebrates, which returns lymph to the blood circulation. The lymphatic system is also important in:

(a) Transport of fat digestion products.
(b) Production of white blood cells and antibodies.


lymph nodes
Ganglions mpl lymphatiques

Lymph nodes are brown cells within the lymphatic system that filter bacteria
From the lymph, it produces white blood cells and antibodies.